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Email Bounce Code Checker

Tell a hard bounce from a soft one, and from a block.

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Or pick a common one

Quick Tool Overview

The Email Bounce Code Checker reads a bounce message or a bare SMTP code and says whether it is a hard bounce, a soft bounce or a block aimed at you — three cases that need three different responses.

What it does
Classifies a bounce and says what to do about it
You give it
A bounce message, or just its status code
You get back
Hard, soft or block, with the cause and the action
Codes covered
RFC 3463 enhanced codes and basic SMTP replies
Best for
Deciding whether to remove an address or fix your setup
Email Validator Tools Free, unlimited use No sign-up Runs in your browser

About the Email Bounce Code Checker

Paste a bounce — the whole message, or just the code out of it — and get three things: what kind of failure it was, what caused it, and whether the address should come off your list.

The third category is the one that gets missed. A hard bounce means the mailbox does not exist and the address should go. A soft bounce means it was temporarily unavailable and your sender will retry. But a block is neither: the address is perfectly good and the receiver refused *you*, on reputation or authentication grounds. Deleting the address is exactly the wrong response, and it is a common one.

Both the enhanced status codes from RFC 3463 and the basic SMTP reply codes are recognised, and when there is no code at all the phrasing every mail server writes is matched instead — "user unknown", "mailbox full", "greylisted", "blocked using".

Key features of the Email Bounce Code Checker

Three outcomes, not two

A block means the address is fine and you were refused.

Both code families

Enhanced status codes and basic SMTP reply codes.

Works without a code

Falls back to the phrasing mail servers actually write.

Recipient extracted

The address that bounced is pulled out of the message.

A clear next step

Remove, retry or fix authentication — stated explicitly.

How to use the Email Bounce Code Checker

  1. 1

    Paste the bounce

    The whole message, or just the status code from it.

  2. 2

    Read the classification

    Hard bounce, soft bounce, or a block aimed at you.

  3. 3

    Check the cause

    What the code means in the words the RFC uses.

  4. 4

    Do what it says

    Remove, retry, or fix your sending setup — they are different.

Frequently asked questions

A hard bounce is permanent — the mailbox or domain does not exist, and the address should be removed at once. A soft bounce is temporary, usually a full mailbox or a busy server, and your platform will retry it for you.

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